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The Rolex yachtmaster is an automatic watch so needs no battery.IF the watch is a genuine Rolex then it needs to, be seen by a Rolex watchmaker to estimate.www.rolexrepairs.co.uk will provide a free estimate,or give them a call the watchmakers will be happy to advise you.
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How much did you pay? the watch is guaranteed a fake. When Fake watches are made they are all marked 18k because they do not make different parts for ones that are going to be stainless steel and ones that are going to be gold plated.